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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      https://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.commons.validator;
18  
19  import java.text.DateFormat;
20  import java.text.ParseException;
21  import java.text.SimpleDateFormat;
22  import java.util.Locale;
23  
24  /**
25   * <p>Perform date validations.</p>
26   * <p>
27   * This class is a Singleton; you can retrieve the instance via the
28   * getInstance() method.
29   * </p>
30   *
31   * @since 1.1
32   * @deprecated Use the new DateValidator, CalendarValidator or TimeValidator in the
33   * routines package. This class will be removed in a future release.
34   */
35  @Deprecated
36  public class DateValidator {
37  
38      /**
39       * Singleton instance of this class.
40       */
41      private static final DateValidator DATE_VALIDATOR = new DateValidator();
42  
43      /**
44       * Returns the Singleton instance of this validator.
45       * @return A singleton instance of the DateValidator.
46       */
47      public static DateValidator getInstance() {
48          return DATE_VALIDATOR;
49      }
50  
51      /**
52       * Protected constructor for subclasses to use.
53       */
54      protected DateValidator() {
55      }
56  
57      /**
58       * <p>Checks if the field is a valid date.  The {@link Locale} is
59       * used with {@link DateFormat}.  The setLenient method
60       * is set to {@code false} for all.</p>
61       *
62       * @param value The value validation is being performed on.
63       * @param locale The locale to use for the date format, defaults to the default
64       * system default if null.
65       * @return true if the date is valid.
66       */
67      public boolean isValid(final String value, final Locale locale) {
68          if (value == null) {
69              return false;
70          }
71          final DateFormat formatter;
72          if (locale != null) {
73              formatter = DateFormat.getDateInstance(DateFormat.SHORT, locale);
74          } else {
75              formatter = DateFormat.getDateInstance(DateFormat.SHORT, Locale.getDefault());
76          }
77          formatter.setLenient(false);
78          try {
79              formatter.parse(value);
80          } catch (final ParseException e) {
81              return false;
82          }
83          return true;
84      }
85  
86      /**
87       * <p>Checks if the field is a valid date.  The pattern is used with
88       * {@link SimpleDateFormat}.  If strict is true, then the
89       * length will be checked so '2/12/1999' will not pass validation with
90       * the format 'MM/dd/yyyy' because the month isn't two digits.
91       * The setLenient method is set to {@code false} for all.</p>
92       *
93       * @param value The value validation is being performed on.
94       * @param datePattern The pattern passed to {@link SimpleDateFormat}.
95       * @param strict Whether or not to have an exact match of the datePattern.
96       * @return true if the date is valid.
97       */
98      public boolean isValid(final String value, final String datePattern, final boolean strict) {
99  
100         if (value == null
101                 || datePattern == null
102                 || datePattern.isEmpty()) {
103 
104             return false;
105         }
106 
107         final SimpleDateFormat formatter = new SimpleDateFormat(datePattern);
108         formatter.setLenient(false);
109 
110         try {
111             formatter.parse(value);
112         } catch (final ParseException e) {
113             return false;
114         }
115 
116         if (strict && datePattern.length() != value.length()) {
117             return false;
118         }
119 
120         return true;
121     }
122 
123 }